Wavear15, how about some additional info as to what makes you happy there? When you fill it up full it reads 450 miles to empty, and then adjusts based on actual consumption. Note that 450 miles to empty at fill up is just over 30mpg. So, if you'd just filled up then drove for 10 or 20 miles with higher than average economy it would bump up to a number like this.

Filled it all the way to the top at my local gas station where it read 420 to empty. Drove 43 miles to a friends place trying to maintain around 60 mph where it dipped to 410 then climbed up to 480. Avg. Mpg reading was 39.0 when I got there.

It climbed all the way to 490 by the time I got to work today, 57.5 mile trip total averaging at 38.7 MPG.